"en cueros vivos" meaning in Spanish

{
  "head_templates": [
    {
      "args": {},
      "expansion": "en cueros vivos",
      "name": "es-adv"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "that are kings like Adam\nWho reign undress'd",
          "ref": "1635, Félix Lope de Vega y Carpio, El piadoso aragonés:",
          "text": "[…]que son reyes como Adán,\nque reinan en cueros vivos.",
          "type": "quote"
        }
      ],
      "glosses": [
        "naked, buck naked"
      ],
      "id": "en-en_cueros_vivos-es-adv-YJh3~29w",
      "links": [
        [
          "naked",
          "naked"
        ],
        [
          "buck naked",
          "buck naked"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) naked, buck naked"
      ],
      "synonyms": [
        {
          "word": "desnudo"
        },
        {
          "word": "en bolas"
        },
        {
          "word": "en pelotas"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "en cueros vivos"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "en cueros vivos",
      "name": "es-adv"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Spanish adverbs",
        "Spanish entries with incorrect language header",
        "Spanish idioms",
        "Spanish lemmas",
        "Spanish multiword terms",
        "Spanish terms with quotations"
      ],
      "examples": [
        {
          "english": "that are kings like Adam\nWho reign undress'd",
          "ref": "1635, Félix Lope de Vega y Carpio, El piadoso aragonés:",
          "text": "[…]que son reyes como Adán,\nque reinan en cueros vivos.",
          "type": "quote"
        }
      ],
      "glosses": [
        "naked, buck naked"
      ],
      "links": [
        [
          "naked",
          "naked"
        ],
        [
          "buck naked",
          "buck naked"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) naked, buck naked"
      ],
      "synonyms": [
        {
          "word": "desnudo"
        },
        {
          "word": "en bolas"
        },
        {
          "word": "en pelotas"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "en cueros vivos"
}